You will often find a recommended annealing schedule on the website for each glass company.
Bullseye has a range of educational information available on their website - much of it may be applied to other types of glasses:
https://www.bullseyeglass.com/education/
Annealing Chart for Thick Slabs:
https://www.bullseyeglass.com/pdf/other_tech/annealing_thick
.pdf
Gaffer Glass
Annealing schedule for casting crystal:
https://www.gafferglass.com/technical/annealing.htm
They have additional information about specific colors that need additional attention: https://www.gafferglass.com/ / "Technical"
You may wish to contact Blenko for more information about their glasses:
304-743-9081
1-877-4BLENKO
FAX: 304-743-0547
Email: blenko@usa.net
Snail Mail: Blenko Glass Company P.O. Box 67 Milton WV. 25541
Annealing a piece of thick glass can be very complicated. For general technical information, you may wish to read the chapter on "Annealing and Compatibility" in:
Bray, Charles. Ceramics and Glass: A Basic Technology. Sheffield, England: Society of Glass Technology, 2000, pp.146-152.
In his book, Techniques of Kiln Formed Glass, Keith Cummings publishes a variety of annealing schedules for cast glass based on the thickness of the glass, the annealing point of specific glass, and the strain point of specific glass. [London: A & C Black; Philadelphia: University of Pennsylvania Press, 1997] The supplier of your batch or cullet (if you are using a standard mix) can provide annealing schedules as well as the annealing point and strain point.
Another excellent discussion is Dr. Frank Wooley's chapter on "Annealing Cast Glass," in Lucartha Kohler's book Glass: An Artist's Medium (Iola, WI: Krause Pubilcations, 1998, pp. 212-217). He includes a chart for "Annealing Schedules for Casting Glasses
(Conservative Schedules for All Soda-Lime and Lead Glasses)" p. 217.
If you wish to obtain copies of any of these items, please contact your local library. The Rakow Research Library is a member of OCLC; your library can contact us through OCLC or they may mail an Interlibrary Loan form to us. You may request up to five items at a time. We send photocopies of articles and microfiche copies of our books (if they have been microfilmed) through Interlibrary Loan for four weeks use.
Also, these books are in-print and available from book dealers.
I am also sending our bibliographies for annealing glass and coefficient of expansion.
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